🌉 Bridge Builder Junior: Trusses, Arches & Load Tests

Build a pin-jointed wood or steel truss across a brook and a stream, then roll an 8-tonne test truck over it and watch every beam glow green to red as it is pulled or pushed. Learn why triangles are rigid, why long thin sticks bend first, and how safety factor and cost trade off.

3D · Three.js / WebGL renderer · 60 FPS target · runs fully client-side, no install